Rare earth and carbon co-penetration process of gear

Abstract

The invention discloses a rare earth and carbon co-penetration process of a gear. The rare earth and carbon co-penetration process of the gear is characterized by comprising the following steps: preparing materials; feeding a cleaned gear blank into a carburizing furnace; adding a rare earth carburizing agent; performing rare earth carburizing, wherein the carburizing furnace is internally heated by raising the temperature by sections; cooling, namely, closing a heating system after the temperature of the carburizing furnace meets the standard, and naturally cooling the gear blank to be 300 DEG C; quenching; feeding the carburized gear blank into a heating furnace to heat to reach 800 to 850 DEG C; maintaining the temperature for 1 hour; transferring into a quenching medium to cool; and then tempering at low temperature, wherein the tempering temperature is 160 to 220 DEG C, and the tempering costs 5 hours. With the adoption of the rare earth and carbon co-penetration process of the gear, the shortcomings of the prior art are overcome; kerosene and rare earth fluid are added to the traditional solid carburizing raw material, the rare earth fluid is fully uniformly distributed on the surfaces of the carburizing raw material and the gear blank in a free form through the kerosene as the medium by the secondary heating method, and thus the carburizing speed can be raised by 15 to 30%; in addition, structure of the carburizing layer is fined, so that the performance of the carburizing layer can be improved; the rare earth carburizing and Afton quenching medium are coordinated to further reduce the deformation of the gear, and as a result, the gear quality is improved.

Description

technical field [0001] The invention relates to the technical field of gear production, in particular to a gear rare earth carburizing process. Background technique [0002] There are many problems in the existing carburizing process. First, the carburizing speed is slow, the production efficiency is low, and the energy consumption remains high; second, the carburizing temperature is high, and the carbon potential Cp is high, resulting in poor metallographic structure, carbide, The grades of martensite and retained austenite are relatively high, and the grade fluctuates greatly, and the stability is poor; the third gear has large dimensional distortion after heat treatment, the accuracy grade is greatly reduced, the assembly interchangeability is deteriorated, the transmission is not stable, and the noise is large. [0003] With the development of the globalization trend of the automobile market, China will surely become the main market for global auto parts manufacturers an...

AI Technical Summary

Problems solved by technology

[0002] There are many problems in the existing carburizing process. First, the carburizing speed is slow, the production efficiency is low, and the energy consumption remains high; second, the carburizing temperature is high, and the carbon potential Cp is high, resulting in poor metallographic structure, carbide, The grades of martensite and retained austenite are relatively high, and the grade fluctuates greatly, and the stability is poor; the third gear has large dimensional distortion after heat treatment, the accuracy grade is greatly reduced, the assembly interchangeability is poor, the transmission is not stable, and the noise is large

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